One vertex per element, one color per generator, with an edge from x to x·s.
(9,10,14,13)(11,15,19,18)(12,20,22,16)(17,24,21,23)(25,26,31,36)(27,34,29,32)(28,30,35,33)(37,40,39,38)(1,2)(3,7)(4,5)(6,8)(10,13)(15,18)(16,20)(23,24)(25,27,31,29)(26,32,36,34)(28,39,35,37)(30,40,33,38)(2,5)(6,7)(9,11,14,19)(10,15,13,18)(12,21,22,17)(16,24,20,23)(25,28,31,35)(26,33,36,30)(27,37,29,39)(32,40,34,38)(1,2)(3,6)(4,5)(7,8)(9,12,14,22)(10,16,13,20)(11,17,19,21)(15,23,18,24)(25,29,31,27)(26,34,36,32)(28,39,35,37)(30,40,33,38)(1,2)(3,6)(4,5)(7,8)(9,11)(10,15)(12,17)(13,18)(14,19)(16,23)(20,24)(21,22)(25,30,31,33)(26,35,36,28)(27,38,29,40)(32,39,34,37)(1,3)(2,6)(4,8)(5,7)(9,13,14,10)(11,18,19,15)(12,20,22,16)(17,24,21,23)(25,26)(27,32)(28,33)(29,34)(30,35)(31,36)(37,40)(38,39)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.